Song Na Young and her husband, Jung Sung Min, desperately want a child but her husband is unable to get her pregnant. Her husband's friends decide to help them. But Na Young suddenly loses her husband in an accident and she gives birth to her daughter but does not know which of her husband's friends fathered her child. The father of Na Young's child can either be Han Soo Hyun, Choi Kwang Hee, or Hwang Kyung Tae.

Min Ki Seo and Lee Young Shim hated the sight of each other at first but later developed affections along the way during their daily fights and disagreements. Min Ki Seo was a doctor who looked down on people and was a haughty person until he met Lee Young Shim and her child who had AIDS. Lee Young Shim was a very cheerful and positive person despite the difficult life she was facing. Through her, Min Ki Seo slowly changed for the better into a warm and caring person.